Reorganize Info Screen

Several new features for Info Screen and Scan Screen.

Enhancements

• Info Screen:

  • fix and revise use of locks (#78),
  • reorganize and revamp screen layout,
  • add detailed retry and band information,
  • better handling of initialization (avoid blank screen),
  • scrap display of encryption keys (#80),
  • display warning if interface is down,
  • display warning if interface is disabled due to rfkill,
  • display the interface index of the wireless interface;

• Scan Screen:

  • add band filtering (#77),
  • add filtering for hidden Essids (#73),
  • add Information Element enum (#73),
  • add a notice if station is mesh-enabled,
  • more efficient filtering (right at source);

• History Screen:

  • improve legend format (only show what is needed),
  • improve format robustness against window resizing,
  • no longer erase existing data (keep it for the next time);

• Menu Bar:

  • unused keys are no longer displayed,
  • shortcut keys are now configurable;

Miscellaneous

• cleaned up and updated various header files;
• build: add a check for <ncursesw/curses.h> (#21),
• build: add explicit LICENSE file (#80),
• build: simplify colour pairs.